Swing lock fastener



Jan. 6, 1942.

A. HAM

SWI-NG LOCK FASTENER Filed March 4, 1941 Y barvwhile the post isbeing Vturned during `sW'INe Loox FASTENER Albert Hahn; Upper Darby; Y Application Marchi; 1941,v seslfN. ssig'ec i s oi'a'imsf (c1. 292462) f Myzinvention relates to a new :and useful swing lock fastener and has for one of its objects to provide an exceedingly simple'and effective device of, this character forjsecurely fastening together two members, such as a` framegand paneLgorvfor holdingone member in closed re.-v

lation to another, such as a' door'relative toa cooperating wall. The fastener is especially adapted for use in aircraft construction for holding inlplace certain parts such as inspection plates, ooring; cowling and removable sections; It is tobe understood that these are merelyexamples.A used for purpose of-expla'nation ofthe invention and' that such a fastener can ployed Wherever applicable.

Another object of the invention is to provide a wing lock fastener including ar bar to be `robe emf Fig. 5'. likewise isfa 'similar View. in a fully locked y position.'

Fig..6 is a Asectionfon Figy'l is a sectionY on theline .'l-l of Fg..3.v Fig-.18 'is a lfragmentary sectional view similar to Fig-. 5' showing' a modification..

In-carrying outthe invention as herein em-y bodied-fv I0 represents a member, ysuch asa Wall,

one fed'ge maya be a .strengtheningstrip l2.

a secondmember 1,3 or closure provided with an offset `lip yM for insertion in'theopening V l l un'der tated and movedlto and fro by operating :means which places said bar in or out of operative 'positionand draws, the same tight or; releasesfit.k v

Another objectof .the present invention. is to construct a'swing lock fastener consisting-of a bar carrying a sleeve having cam surfaces engaged'by projections on a rotatable post which is rotatabley and slidableunder certain condi? tions, relative to said bar.

A further object of thisinvention is ploy a spring or equivalent resilient mea-ns for urging the bar longitudinally in one direction along the post.

A still further object of the present invention is to provide stops which prevent rotation of the the tightening or releasing operations. f

With the above and otherobjects in view, this invention consists of the details of construction and` combination of elements hereinafter set forth and then designated by the claims.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, I will describe its construction, referring bynumerals to the accompanying drawing forming a part hereof,k in

which:

Fig. 1 is a front elevation or face view of two members, one of which is held in a closed pysition by a swing lock fastener constructed in.

Fig. 4 is a similaiview in a partially locked position.

to `ernian edge' of fthe 'member wat yone side of said opening. Onaface of -the member |13 Yis mounted a keeper platev I SMpreferably havingy a ridge. i6 formed alongr its rear edgeA and provided with a flange- Hiatsits froni,fedge .v This flangeis fashioned .tol provide along stop shoulder i8 in the path of Vforward travel of the Arota-table bar; to be vpresentlydescribed,` and a short stop shoulder I 9; which,y :under certainfconditions, will be disposedftothe rear of said rotatable; bar. Said stopshoulders are spaced` apart and, the forma-A tion thereof incidentally provides a notch 20. l., A post; or shank 2| is rotatably mounted in and projectsfthrough themembery I3 andthe keeper plate |5. with yanenlargement. or heady 22 on the outer end of said post to provide a shoulder to prevent said post from being displaced inwardly. This enlargement may be'of any suit- 1 ablelconflguration so as to be rotatable by hand or by, the useof,a Wrench ror screwdriver.- rOn the innerportion or end of` the post opposite the enlargement 22 is slidably andorotatably mounted the .bar v23` carrying a sleeve :24 von which are formedthe.,oppositel-y disposedcam surfaces 25'extending in the same direction similar to a screw thread., Of course, a single cam surface cam surfaces a contact shoulder 26 is providedv at each end' of each cam surface for a purpose to be hereinafter set forth.. Where the cam surfaces are produced by forming slots actually duplex cams are provided consisting of the cam surfaces 25 and opposed parallel cam surfaces 2T.

Cam followers 28 are carried by the post 2| and these may be the ends of a pin projected through said post and extending into the slots illustrated in Figs. 3 to 7 inclusive or into the notches depicted in Fig. 8.

The bar 23 and componentl parts are urged outwardly by a spring 29, preferably of the helical type, and in such case said spring encircles the post 2| and Iengages the keeper plate I5, as the stationary element, and the bar 23 as the movable element. Of course, where the cam surfaces are provided by the slot formations or duplex cam surfaces are otherwise provided, the

spring can be dispensed with, but in such a, caseu In actual practice, after the member- I3- is.

placed in proper relation to the member II), as

shown in Fig. 3, and while the lugs 28 are in re-i tracted positions, the post 2| is rotated in a direction to turn the bar 23 over the contiguous edge of the member IIJ of the opening I I, thus fastening the member I3 to said member I0', as illustrated in Fig. 4. Although the two members are now fastened together, the joint may not be completely closed, but by continuing to rotate the post 2l, the rotation of the bar having been stopped, the cam follower 28 will be caused to travel up the cam surfaces 25 to draw the member I3 tight against the member I0. This action will also position the stop shoulder I9 behind the bar 23.

To release the fastener, the post 2I is rotated in the reverse direction and since the bar 23 is temporarily held against rotation by the stop shoulder I9 the cam followers 28 will travel down the cam surfaces and by their engagement with the cam surfaces 2`I or through the action of the spring 29 or both the member I3 will be moved away from the member I0 until the stop shoulder I9 is removed from the path of reverse travel of the bar 23. When the cam followers 28 engage the shoulders 26 at the lower ends of the cam surfaces said cam followers will pick up the bar 23 through the medium of the sleeve 24 and cause said bar 23 to rotate with the post 2I and dis'- engage said bar from the edge of the member I0 or the parallel leg of the strengthening bar, if

the latter is used. Thereafter the member I3 can be swung open or completely disengaged from the member I0. l

It is to be particularly noted that duringoperation it requires only one-half of a turn of the post or screw to lock or unlock the fastener, that is, one-quarter of a turn swings the bar to an operative or inoperative position and onequarter of a turn tightens or releases the grip.

Of course I do not Wish to be limited to the exact details of construction herein shown and described, as these may be varied within the scope of the appended claims without departing from the spirit of my invention.

Having described my invention, what I claim as new and useful is:

1. A swing lock fastener comprising a supporting member, a post journalled on said supporting member, a bar slidably and rotatably mounted on said post, a sleeve carried by said bar and embracing the post, a cam surface on said sleeve, a shoulder at the low end of said cam surface, a high stop shoulder in the path of forward travel of the bar, an opposed low stop shoulder spaced from the high stop shoulder a distanceat least equal to the width of said bar, a

.cam follower on the post for cooperation with the cam surface and contiguous shoulder whereby rotation of the post in one direction will turn the bar in the same direction and move said bar longitudinally of the post in a latching directionas the bar is arrested by the high stop shoulder, and when the post is rotated in the opposite direction said bar will be permitted to move longitudinally of the post in an unlatching direction while the bar is arrested by the low stop shoulder and then turn the bar in the opposite direction, and means to normally urge the cam surface against the cam follower. Y l

2. In a device of the kind described, a supporting member, a keeper plate provided with a right angle flange, opposed stop shoulders onl said flange, a rotatable post journalled on said supporting member, a bar slidably and rotatably assembled on said post, a sleeve carried by said bar and embracing the post, two pairs of parallel cam surfaces on said sleeve intermediate the ends thereof, shoulders at the ends of the pairs of cam surfaces, cam followers on the post cooperating with the cam surfaces and at least the shoulders at the lower ends of said cam surfaces, and a spring between said supporting member and said bar. 3. A swing lock fastener including apost rol" tatably mounted on a supportingmember, a bar slidably and rotatably mounted on said post, a sleeve carried by said bar and having a smooth bore and embracing the post for rotary and sliding movements on said post, a cam surface on said sleeve, a shoulder at the low end ofsaid cam surface, means to arrest the forward rotary movement of the bar, means to temporarily arrest the backward rotary movement of said bar, means on the post cooperating with the cam surface and the shoulder, and means to urge the bar away from said supporting member.

ALBERT HAIM. 

